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drm/i915: Replace open coded MI_BATCH_GTT 

The (2<<6) virtual memory space selector harks back to gen3 and is
mandatory given our use of GTT space for batchbuffers. On gen4+, use of
the GTT became mandatory and bit6 marked reserved. However the code must
now explicitly set (1<<7), which conveniently is also (2<<6).

To clarify the meaning for future readers, replace the open coded (2<<6)
with MI_BATCH_GTT.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-04-17 16:38:12 +01:00 committed by Daniel Vetter
parent 7b09638f45
commit 65f5687603
2 changed files with 4 additions and 2 deletions
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1
drivers/gpu/drm/i915/i915_reg.h
View File

@ -231,6 +231,7 @@
#define MI_BATCH_NON_SECURE (1)
#define MI_BATCH_NON_SECURE_I965 (1<<8)
#define MI_BATCH_BUFFER_START MI_INSTR(0x31, 0)
#define MI_BATCH_GTT (2<<6) /* aliased with (1<<7) on gen4 */
#define MI_SEMAPHORE_MBOX MI_INSTR(0x16, 1) /* gen6+ */
#define MI_SEMAPHORE_GLOBAL_GTT (1<<22)
#define MI_SEMAPHORE_UPDATE (1<<21)

5
drivers/gpu/drm/i915/intel_ringbuffer.c
View File

@ -786,7 +786,8 @@ i965_dispatch_execbuffer(struct intel_ring_buffer *ring, u32 offset, u32 length)
return ret;
intel_ring_emit(ring,
MI_BATCH_BUFFER_START | (2 << 6) |
MI_BATCH_BUFFER_START |
MI_BATCH_GTT |
MI_BATCH_NON_SECURE_I965);
intel_ring_emit(ring, offset);
intel_ring_advance(ring);
@ -823,7 +824,7 @@ i915_dispatch_execbuffer(struct intel_ring_buffer *ring,
if (ret)
return ret;
intel_ring_emit(ring, MI_BATCH_BUFFER_START | (2 << 6));
intel_ring_emit(ring, MI_BATCH_BUFFER_START | MI_BATCH_GTT);
intel_ring_emit(ring, offset | MI_BATCH_NON_SECURE);
intel_ring_advance(ring);